This to elaborate on my sighting,and to confirm the date (I read the posted report and saw the remarks). One thing I failed to mention was the absence of contrails. This didn't strike me as unusual at the time, but does now. Also the sudden change of course would have imposed bone crushing G-forces. I am no expert on aircraft, but do know enough about physics and the physiology of the human body to be certain that no human could have survived that manuever.